<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script src="js/vue.js"></script>
    <div id="app">
       <counter></counter>
    </div>

    <script>
    //如果组建内部的data属性不是一个函数，会在控制台报出警告
        Vue.component('counter',{
            data:{
                num:0
            },
            template:`<button @click="num++">点击{{num}}次</button>`
        })

        let vm = new Vue({
            el: "#app",
            data: {
                msg: 'hello world'
            }
        })
    </script>
</body>

</html>